package com.lzh.seatrend.config;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * @Classname ApplicationContextHelper
 * @Description 可以通过该类，获取bean对象
 * @Date 2021/9/2 16:30
 * @Created by liuzihao
 */
@Component
public class ApplicationContextHelper implements ApplicationContextAware {

    /**
     * ApplicationContext
     * 继承BeanFactory的
     */
    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if (ApplicationContextHelper.applicationContext == null){
            ApplicationContextHelper.applicationContext = applicationContext;
        }
    }

    //获取ApplicationContext
    public static ApplicationContext getApplicationContext(){
        return applicationContext;
    }

    //通过name获取Bean
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    //通过class获取Bean
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    //通过name，clazz返回指定的bean
    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name,clazz);
    }
}
